1.开启hystrix

添加了 openfeign 包 默认集成了 hystrix。只需要开启开关

server:
  port: 9080
spring:
  application:
    name: member-service-openfeign
eureka:
  client:
    service-url:
      defaultZone:
        http://localhost:8761/eureka/

feign:
  hystrix:
    enabled: true

2. 调用（controller + 远程调用接口 + 降级实现类）

package com.itlaoqi.springcloud.memberserviceopenfeign.controller;

import com.itlaoqi.springcloud.memberserviceopenfeign.client.BookService;
import com.netflix.discovery.converters.Auto;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;

import java.util.HashMap;
import java.util.Map;

@Controller
@RequestMapping(value="/book",produces = {"application/json;charset=UTF-8"})
public class MemberController {

    @Autowired
    private BookService bookService;


    @GetMapping("/sendMess")
    @ResponseBody
    public Map<String,Object> sendMess(@RequestParam("phone")String phone){
        Map<String,Object> paramMap = new HashMap<>();
        paramMap.put("phone",phone);
        Map<String,Object> res = bookService.sendMess(paramMap);
        return res;
    }
}

远程调用接口
package com.itlaoqi.springcloud.memberserviceopenfeign.client;

import com.itlaoqi.springcloud.memberserviceopenfeign.client.impl.BookServiceFallback;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestParam;

import java.util.Map;

//http://book-service/test?XXX
@FeignClient(name = "book-service",fallback = BookServiceFallback.class)
public interface BookService  {
      
     // 注意： RequestBody  map 通过请求体发送
    @PostMapping("/sendMess")
    public Map<String,Object> sendMess(@RequestBody Map<String,Object> paramMap);

}

package com.itlaoqi.springcloud.memberserviceopenfeign.client.impl;

import com.itlaoqi.springcloud.memberserviceopenfeign.client.BookService;
import org.springframework.stereotype.Component;

import java.util.HashMap;
import java.util.Map;


// 降级实现类
@Component
public class BookServiceFallback implements BookService {

    public Map<String, Object> sendMess(Map<String, Object> paramMap) {
        Map<String,Object> resultMap = new HashMap<>();
        resultMap.put("code",-1);
        resultMap.put("message","发送短信失败");
        return resultMap;
    }

}

springCloud(十) hystrix 和 openFeign 整合

原文：https://www.cnblogs.com/guhualin/p/13122195.html